mTOR激活的全质性机制可以告知比托普抑制剂优化
Yonglan Liu1, Mingzhen Zhang2, Hyunbum Jang2
1Cancer Innovation Laboratory, National Cancer Institute Frederick MD 21702 USA.
Chemical science
|January 19, 2024
概括
我们阐明了mTOR激酶激活的机制,揭示了它的负调节器域如何控制催化裂形状. 这一发现有助于开发针对癌症和神经发育障碍的向治疗方法.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 结构生物学 结构生物学
背景情况:
- 在细胞过程中,PI3K/AKT/mTOR通路至关重要,其核心是mTOR激酶.
- mTOR信号的失调与癌症和神经发育障碍有关.
- 由于复杂的mTOR机械,mTOR的催化核心的精确激活机制仍然不完全理解.
研究的目的:
- 阐明控制mTOR激酶激活的结构动态.
- 详细说明负调节器域 (NRD) 在控制mTOR催化活动中的作用.
- 研究瘤突变对mTOR构造和活性的影响.
主要方法:
- 使用了广泛的分子动力学 (MD) 模拟.
- 已发表的实验数据被编译和分析.
- 研究了NRD定位的结构和功能影响.
主要成果:
- NRD的位置决定了mTOR的催化裂形状:NRD IN导致一个封闭的裂,限制了基板的访问,而NRD OUT则有利于一个开放的裂.
- 一种瘤基因突变 (L2427R) 已被证明可以将mTOR转移到一个更活跃的开放形状.
- 这项研究提供了关于像RMC-5552这样的双层抑制剂中的链接长度如何影响与不同mtor变体的结合亲和力的见解.
结论:
- 该NRD作为一个关键开关,控制mTOR催化裂可访问性和激酶活性.
- 了解mTOR激活机制和突变效应可以为药物设计提供信息.
- 优化抑制剂链接长度,例如RMC-5552,可以提高针对特定mTOR变体和突变的疗效.
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